Allen-Bradley micrologix 1500, User Manual

Page: 38 / 149

Publication 1764-UM001A-US-P
3-2 Wiring Your Controller
•
Allow for at least 50 mm. (2 in.) between I/O wiring ducts or terminal strips
and the controller.
•
Route incoming power to the controller by a path separate from the device
wiring. Where paths must cross, their intersection should be perpendicular.
•
Separate wiring by signal type. Bundle wiring with similar electrical
characteristics together.
•
Separate input wiring from output wiring.
•
Label wiring to all devices in the system. Use tape, shrink-tubing, or other
dependable means for labeling purposes. In addition to labeling, use colored
insulation to identify wiring based on signal characteristics. For example, you
may use blue for dc wiring and red for ac wiring.
Wiring without Spade Lugs
When wiring without spade lugs, it is recommended to keep the finger-safe covers
in place. Loosen the terminal screw and route the wires through the opening in the
finger-safe cover. Tighten the terminal screw making sure the pressure plate secures
the wire.
ATTENTION
!
Calculate the maximum possible current in each power and
common wire. Observe all electrical codes dictating the
maximum current allowable for each wire size. Current above the
maximum ratings may cause wiring to overheat, which can cause
damage.
United States Only : If the controller is installed within a
potentially hazardous environment, all wiring must comply with
the requirements stated in the National Electrical Code 501-4
(b).
NOTE
Do not run signal or communications wiring and power wiring
in the same conduit. Wires with different signal characteristics
should be routed by separate paths.
Finger-Safe Cover